201533http://basparesh.ippi.ac.ir/article_1272_d12008d9db04a5319adcf162dea2dca5.pdfEthylene-Octene Copolymer/Nanocaly Nanocomposites: 1- A Review on Morphology, Crystalization and Thermal PropertiesMohammadRazavi-Nouriعضو هیئت علمی-پژوهشگاه پلیمر و پتروشیمی ایرانauthorMasoudTayefiدانشجو-پژوهشگاه پلیمر و پتروشیمی ایرانauthorAlirezaSabetعضو هیات علمی-پژوهشگاه پلیمر و پتروشیمی ایرانauthortextarticle2015perPolyethylenes are among of the commodity polymers with wide-spread applications. They are being used in transportation, wire and cable, food packaging, and building industries, for instance. Ethylene-octene copolymers contain more branches in respect to that of the high density polyethylene, therefore, their crystallinities and melting points are lower and can also be processed much easier. Nowadays, there are huge interests in using polymer-clay nanocomposites because of their higher desired physical and mechanical properties such as thermal stability, tensile strength and barrier resistance in comparison with that of the unfilled polymers or the polymers which are reinforced with the same amount of micro-sized fillers. Nanoclays are modified using organic modifiers such as alkylammonium ions in order to enhance their compatibility with polymers. They can also act as a nucleating agent and change the crystallinity of polymeric materials. This nano-sized filler could also affect the thermal stability and flame retardancy but the amount of influence depends on the morphology developed. In this article, our aim is to present some information about the above-mentioned nanocomposites by reviewing the recently published papers in this area.BaspareshIran Polymer and Petrochemical Institute2252-04495

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2015415http://basparesh.ippi.ac.ir/article_1215_45d7fafbd09fb058708cf5540cde60d8.pdfdx.doi.org/10.22063/basparesh.2015.1215Surface modification of magnetite nanoparticles via “Click” reaction and their used in biomedical applicationsسپیدهخوئیعضو هیئت علمی دانشگاه تهرانauthorیوسفباقریدانشجوی کارشناسی ارشدauthortextarticle2015perDuring the last decades, great efforts have been devoted to design polymers for reducing the toxicity, increasing the absorption, and improving the release profile of drugs. Magnetic nanoparticles (MNPs) have found various important applications in nanotechnology and nanomedicine in the areas of diagnosis, targeting and therapy. For all of these applications, MNPs surfaces must be tailored to improve biocompatibility properties and reduce aggregation. Since the introduction of the click concept by Sharpless and coworkers in 2001, numerous examples of click reactions have been reported for the preparation and functionalization of polymeric micelles and nanoparticles, liposomes and polymersomes, capsules, microspheres, metal and silica nanoparticles, carbon nanotubes and fullerenes, or bionanoparticles. Among the chemical reactions which used for magnetic nanoparticles modification, Click chemistry with its unique features such as high aqueous competency, chemical orthogonality, and applicability toward diverse substrates has emerged as a burgeoning strategy for the development of surface-engineered polymers and nanoparticles with high selectivity and efficiency.BaspareshIran Polymer and Petrochemical Institute2252-04495

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20151626http://basparesh.ippi.ac.ir/article_1232_183783a7f8a602766e7a6068a3c447e9.pdfdx.doi.org/10.22063/basparesh.2015.1232A Review on Rubber Wearrasoulesmaeely neisianyکارشناس- دانشگاه صنعتی اصفهانauthorrouhollahbagheriهیئت علمی-دانشگاه صنعتی اصفهانauthortextarticle2015perRubber wear is one of the most important issues in rubber industry. Reduction of rubber wear and extending its life-time has been a crucial subject for researchers in this industry due to Spreading abraded rubber and worn tires in the environment lead to pollution of it, so this phenomena is mentioned as an important global concern. Scientific and Correct understanding of rubber wear mechanism is critical for reduction of Rubber wear and modification of the tribologiacl behavior. At the first, in this paper the previous researches about recognizing and reduction of rubber wear are reviewed. To aim this idea some researches for rubber wear reduction by using blends system and reinforcement (especially nano filler) are mentioned. Then the types of rubber wear are introduced. Then, rubber wear theories are discussed to better understanding about this phenomenon. At the last, standard method for measuring rubber wear for correct selection are reviewed.BaspareshIran Polymer and Petrochemical Institute2252-04495

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20152735http://basparesh.ippi.ac.ir/article_1212_83373c9f96bff25858267a309313dd8d.pdfdx.doi.org/10.22063/basparesh.2015.1212Hydrophobicity Modification of Water-soluble PolymersMohammadKohestanianدانشجو پژوهشگاه پلیمر و پتروشیمی ایرانauthorHoseinBohendiعضو هیئت علمی پژوهشگاه پلیمر و پتروشیمی ایرانauthortextarticle2015perPolymer modification technique is a valuable synthetic approach which leads tomodified polymers with unique composition, structure, and properties that cannotbe readily achieved by direct polymerization of monomers. Since 1990, polymermodification technique has become a most important method for improving the propertiesof polymers and extending the range of their application. Nowadays, the modifiedpolymers such as cellulose and poly acrylic acid are available on a commercial scale inthe world. Hydrophobically modified polymers (HMPs) have attracted a great deal ofinterest because of their unusual rheological properties.These polymers consist of watersolublehydrophilic backbones and a small amount (typically < 2-5 mol%) of covalentlybonded hydrophobic moieties called "stickers". The molecular architecture as well as thecharacteristics of the hydrophilic chain and stickers can vary widely. Therefore, the diversestructural architectures of these modified polymers (random, block or hydrophobically endcapped)produce diverse physicochemical properties, which lead to useful applications inpharmaceutics, dispersants, thickening agents, cosmetics and oil recovery.BaspareshIran Polymer and Petrochemical Institute2252-04495

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20153648http://basparesh.ippi.ac.ir/article_1277_ee43bb93b7717bd0683047f272d52db3.pdfdx.doi.org/10.22063/basparesh.2015.1277Application of Three-Dimensional Polymers as Drug Carriersfatemehzareieدانشگاه فردوسی مشهد- دانشکده مهندسی-گروه مهندسی شیمیauthorNafisehFarhadianعضو هیات علمیauthorzahramaghsoudدانشگاه فردوسی مشهد- دانشکده مهندسی-گروه مهندسی شیمیauthortextarticle2015perIn recent years, designing novel drug delivery systems using new technologies such as nano as well as nano-drug synthesis for treatment of various disease has been considered from researchers' point of view. The main goal of these novel designed systems is decreasing the side effects of drugs by controlling the applied dosage and releasing of drugs at the subject point. To do so, different drug carriers with the unique properties have been suggested. Nanoparticles are one of the most important carriers in this field. To improve the bonding of the drugs to the outer surface of these nanoparticles, biodegradable and biocompatible polymers with low toxicity can be used. These biodegradable polymers have been used frequently as drug delivery vehicles due to their grand bioavailability, better encapsulation, to increase the chemical stability, control release and less toxic properties. However, these polymers should have special structural, physical and chemical properties. This review is an introduction to these polymers which apply in drug delivery systems by a particular attention on three-dimensional polymers such as dendrimers, hyper-branched and star polymers.BaspareshIran Polymer and Petrochemical Institute2252-04495

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20154959http://basparesh.ippi.ac.ir/article_1233_60eaab601cdfd5a8d3106e885be337de.pdfdx.doi.org/10.22063/basparesh.2015.1233Common Methods of Surface Modification of Nano-Silica with Approach to Incorporation in Polyurethanesaeedbabaeeدانشگاه صنعتی مالک اشترauthoraminabediniدانشجوauthorzahramonjeziدانشجوauthortextarticle2015perOne of the ways to improve the mechanical properties, thermal and rheological of polyurethane-silica nanocomposites is Surface modification of silica nanoparticles and incorporation modified nanoparticles in polyurethane matrix. This operation is done in two physical and chemical forms. Physical modification is performed based on the physical interactions between silica and modifying agents and the use of surfactants or macromolecules adsorption. chemical modification is performed based on the chemical interactions and using of the grafting to polymer chains and different modification agent based on silicon, boron, titanium, aluminum and etc. that usually silane coupling agent are more important. In order to investigate of amount of silica surface modification is used from different methods such as measurement of the heat of immersion in water and benzene and infrared spectroscopy. In this paper, methods for surface modification of silica with approach to incorporation in polyurethane and also effects of modification by different modification agent on the thermal properties, morphology and hydrophobicity are considered.BaspareshIran Polymer and Petrochemical Institute2252-04495

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20156071http://basparesh.ippi.ac.ir/article_1234_31a34b355a7c2b6348eb43e21dfb6f59.pdfdx.doi.org/10.22063/basparesh.2015.1234Nanocellulose and its reinforcing in various polymersMeysamMehdiniaدانشگاه علوم کشاورزی و منابع طبیعی گرگانauthormehrabmadhoushiدانشگاه علوم کشاورزی و منابع طبیعی گرگانauthortextarticle2015perRegarding to rising on environmental issues, the high rate use of oil resources and the need for ‎environmental friendly materials and processes, it led to many studies on materials derived from ‎renewable resources and has expanded biodegradable or recyclable products. One of these ‎renewable and environmental friendly resources is nanocellulose. nanocellulose studying, as ‎reinforcing agent in nanocomposites, has started since 15 years ago. In this review paper, we ‎investigated the possibility of nanocellulose reinforcing in different polymers and its drawbacks ‎have been discussed.‎Regarding to rising on environmental issues, the high rate use of oil resources and the need for ‎environmental friendly materials and processes, it led to many studies on materials derived from ‎renewable resources and has expanded biodegradable or recyclable products. One of these ‎renewable and environmental friendly resources is nanocellulose. nanocellulose studying, as ‎reinforcing agent in nanocomposites, has started since 15 years ago. In this review paper, we ‎investigated the possibility of nanocellulose reinforcing in different polymers and its drawbacks ‎have been discussed.‎BaspareshIran Polymer and Petrochemical Institute2252-04495

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20157284http://basparesh.ippi.ac.ir/article_1214_84653ef03e0635ec2e4213d83c0a6db5.pdfdx.doi.org/10.22063/basparesh.2015.1214Preparation and Funtionalization of Carbon Nanotubes and Properties of Its Nanocompositeفهیمهعسکریپژوهشگاه پلیمر و پتروشیمی ایرانauthorسلویفرهنگ زادهپژوهشگاه پلیمر و پتروشیمی ایرانauthorهاجرجمشیدیپژوهشگاه پلیمر و پتروشیمی ایرانauthortextarticle2015perThe nanofiller reinforced polymer matrixes are a class of composites material, which have received significant attention both in academia and industry due to having higher mechanical, physical and thermal properties. The carbon nanotubes (CNTs) are the most important nanofillers which can be used as ideal reinforcing agents for high performance polymer matrixes because of their excellent mechanical, thermal and electrical properties and multi-functionality. CNTs are rolled-up graphene sheets which are made long coaxial cylinders. The properties of carbon nanotubes depend on atomic arrangement, the diameters and length of the tubes and morphology or nanostructure. Since CNTs usually agglomerate due to Van de Waals interactions, they are extremely difficult to disperse and align in a polymer matrix. The critical challenge is the development of methods to improve the dispersion of CNTs in the polymer matrix because their enhanced dispersion in polymer matrices greatly improves the mechanical, electrical and optical properties of composites. The functionalization of CNT is an effective way to prevent nanotube aggregation which can maximize interfacial adhesion between CNTs and the polymer matrix. CNTs can be prepared using various methods. In this review, the methods for the dispersion of nanotubes in the polymer matrix, funtionalization and effect of dispersion and funtionalization on properties of composites are described.BaspareshIran Polymer and Petrochemical Institute2252-04495